Hammer with detachable striking head faces



H. K. KERR 3,130,762

HAMMER WITH DETACHABLE STRIKING HEAD FACES April 28, 1964 Filed June 21,1961 r .w w V m Attorney United States Patent This invention relates tohand tools. It is directed to a hammer having detachable and renewablestriking faces, particularly of the type composed of a relatively softmetal, plastic, or other suitable material, whereby operations can beperformed on articles, parts of machinery, sheet metal parts, such asautomobile bodies, aircraft and the like, or in driving studs, bolts orshafts which have threaded portions, without marring the surface andwithout impact damage to the parts.

Hammers having soft, detachable face or striking surfaces formed ofrubber or soft metals or other materials are known in the tool art. Adiificulty with such hammers is that usually they are of relativelylight weight and are not capable of delivering heavy blows against thesurface being struck except by increasing the length of the strokeswhich tends to detract from desired accuracy in the use of the tool.

An important object of this invention is to provide a hammer havingdetachable striking faces formed of soft material, such as rubber,plastic, soft metal or the like, spaced at opposite ends of the head andseparated by and secured to a cylinder which contains a predeterminedamount of heavy, weight imparting material.

An understanding of the construction of the hammer which forms thesubject matter of this invention can be obtained from the followingdescription, reference being made to the accompanying drawing, in which:

FIGURE 1 is a perspective View in section of a hammer having detachablestriking faces which incorporates the improvement of this invention;

FIGURE 2 is an exploded view of the head and handle assembly; and

FIGURE 3 is an enlarged view in section of the chamber which contains apredetermined amount of weight imparting material.

Like reference characters refer to like parts through the followingdescription and attached drawing.

Referring to FIGURE 1, the numeral indicates the handle 11 which isintegral with the head portion 12. It may be formed of metal or plasticmaterial. Preferably, it is formed of a light metal such as aluminum oran aluminum alloy. The handle is formed with a hand gripping end 11 anda hollow head portion 12 at the opposite end which extends at rightangles to the long axis of the handle. Preferably, this head portion 12is cylindrical in shape and terminates, at each end 13-14, in outwardlyextending lips or flanges 1516 adapted to provide seats and alignmentfor the detachable striking faces 1718 described hereinafter.

The striking faces are similar in design and formed of the same orsimilar materials although in modifications of the device, one or bothof the faces may be formed of a relatively soft, non-surface marringmaterial such as rubber, plastic or soft metal or of harder conventionalhammer head material such as steel. Each striking face is circular inshape and formed with a striking surface 1920 carried by a Wall 21-22which is formed to over- 3,130,762 Patented Apr. 28, 1964 lCe lie theflange 1516 and seat against the opposing face of the hammer head.

Each striking face is formed or provided with an internally threadedbore 2324. Striking faces, if made from material other than metal, mayhave a threaded insert cast or moulded within the face material to avoidhaving the threds tear out under usage. The outer surface of the insertis preferably knurled or flanged to ensure retention of the insertwithin the striking face.

A hollow cylinder 25 is shaped to fit snugly Within the hollow handlehead 12 between the exterior ends thereof. This cylinder is formed orprovided at its ends with outwardly extending threaded studs 2627 whichare adapted to be threaded into the internally threaded bores 2324 ofthe striking heads.

Provision is made to fill the cylinder 25 with a predetermined amount ofweight imparting material 30. Mercury and lead shot are suitable weightimparting materials but it will be understood that other material can beused if desired. In the modification illustrated in the drawing, thestud 27 is formed with a passageway 28 which extends to the body of thecylinder to permit the entry of loading material thereinto. This passage28 is closed, at its exterior end, by a removable plug 29.

The improved hammer of this invention possesses several importantadvantages. It can be manufactured with detachable striking faces ofconventional material, such as steel, or striking faces formed ofnon-surface marring or damaging materials. Weight is provided adjacentto the striking tip or head thereby permitting heavy blows of shortstroke and maximum accuracy. The cylinder 25 can be filled completelywith a weight imparting material 30 such as mercury or lead shot thus toproduce maximum hammer weight adjacent to the striking head with minimumexternal dimensions. Alternatively, the cylinder can be only partiallyfilled with weight imparting material thus to obtain optimum strikingforce with minimum hammer rebound.

It will be understood, of course, that modifications can be made in theembodiment of the invention described herein without departing from thescope of the invention defined by the appended claim.

What I claim as new and desire to protect by Letters Patent of theUnited States is:

A hand tool which comprises a handle, a hollow head terminating in openends extending transversely of one end of said handle and integraltherewith, a hollow cylinder fittaible in snug fitting relationship insaid hollow head having closable means for admitting Weight impartingmaterial into said cylinder, a threaded stud extending from each end ofsaid cylinder beyond the open ends of said hollow head, a pair ofstriking faces, and threaded means carried internally by each of saidstriking faces securable in tight fitting relationship to said threadedstuds.

References Cited in the file of this patent UNITED STATES PATENTS2,604,914 Kahlen July 29, 1952 2,808,861 Hughes Oct. 8, 1957 2,989,101Carmien June 20, 1961 FOREIGN PATENTS 582,877 Great Britain Nov. 29,1946

